CN207301140U - The urea pump detection device resetted with overcurrent and overload - Google Patents
The urea pump detection device resetted with overcurrent and overload Download PDFInfo
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- CN207301140U CN207301140U CN201720580118.5U CN201720580118U CN207301140U CN 207301140 U CN207301140 U CN 207301140U CN 201720580118 U CN201720580118 U CN 201720580118U CN 207301140 U CN207301140 U CN 207301140U
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- operational amplifier
- overcurrent
- resistance
- urea pump
- overload
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Abstract
The application provides a kind of urea pump detection device resetted with overcurrent and overload, including controller and the urea pump, the protection circuit and with controller, load and protecting the external power supply that is connected of circuit that are attached thereto, it is characterised in that：Protection circuit is connected with the reset pin of controller.Using the utility model, when load short circuits or overcurrent, protect the output terminal of circuit directly to drag down the reset pin of controller, reset controller, drive end is without any output, so as to avoid the damage of detection device.
Description
Technical field
Technical field of automatic control is the utility model is related to, more particularly, to a kind of urine resetted with overcurrent and overload
Element pump detection device.
Background technology
In automation control system, the urea pump detection device damage caused by overload or short circuit often occurs.
Can urea pump detection device can test urea pump complete required movement on request, detect and mainly join in urea pump
Whether number reaches rated value.Diesel urea pump detection, it is necessary to detection device provide high-power (1-5 amperes) to urea pump into
Row driving.When urea pump occurs damaging or during short trouble, detection device hardware current moment can be caused excessive, easily to detection
Device or urea pump or other loads cause unknown damage, therefore solve the problems, such as detection device overcurrent protection into difficult point and again
In it is weight.
Existing overcurrent or overload protection method have：
1. utilizing fuse, when the electric current by fuse reaches a timing, caused heat reaches on fuse
During its solid-state fusing point, fuse will automatically fuse and play the role of protecting circuit, but the reaction of its overcurrent is more blunt, action
Slowly, it is not enough to realize quick protection；
2. current-limiting resistance is utilized, but protection is not thorough.
Utility model content
In order to overcome the defects of existing, the utility model proposes a kind of urea pump resetted with overcurrent and overload to detect dress
Put, including controller and be attached thereto load, protection circuit, and with controller, load and the outside that is connected of protection circuit
Power supply, load include but not limited to urea pump, it is characterised in that：Protection circuit is connected with the reset pin of controller.
Further, circuit is protected to include sample resistance, the first operational amplifier, the second operational amplifier；Sample resistance
One end ground connection, the anode of the other end connection external power supply of sample resistance, the other end of sample resistance also passes through first resistor
The inverting input of the first operational amplifier is connected, the normal phase input end of the first operational amplifier is grounded by second resistance, the
The output terminal of one operational amplifier connects the inverting input of the second operational amplifier by 3rd resistor；Second operational amplifier
Normal phase input end connect one end of the 4th resistance and one end of the 5th resistance, the other end connection external power supply of the 4th resistance
Cathode, the other end connection ground of the 5th resistance, the output terminal of the second operational amplifier connect answering for controller by the 6th resistance
Position pin.
Further, the second operational amplifier when the voltage of the normal phase input end of the second operational amplifier is more than load maximum
Inverting input input voltage.
Preferably, outer power voltage is 24 volts, and sample resistance is 0.1 ohm, the amplification factor of the first operational amplifier
For 10 times, the normal phase input end voltage of the second operational amplifier lies prostrate for 3.8-4.
Preferably, the first operational amplifier in circuit and the second operational amplifier is protected to be realized using two-stage amplifier,
Such as LM358.
Controller passes through CAN bus or pwm signal driving load.When reset pin resets, the output terminal of controller is without defeated
Go out, namely not driving load, therefore load would not damage.
The urea pump detection device resetted with overcurrent and overload of the utility model, when generation load overload or exports short
Road, when overcurrent occurs, can eliminate overcurrent immediately, protection circuit devcie will not damage.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model one embodiment；
Fig. 2 is the structure diagram of the protection circuit of the utility model one embodiment；
Fig. 3 is the MCU reset pins and load driving structure schematic diagram of the utility model one embodiment.
As shown in the figure, in order to clearly realize the structure of the embodiment of the utility model, specific knot is labelled with figure
Structure and device, but signal needs are only for, it is not intended to the utility model being limited in the specific structure, device and environment,
According to specific needs, these devices and environment can be adjusted or changed by those of ordinary skill in the art, be carried out
Adjustment or modification be still included in the scope of appended claims.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment to the urea pump provided by the utility model resetted with overcurrent and overload
Detection device is described in detail.
Do herein with explanation, in order to make embodiment more detailed, the following examples are optimal, are preferable to carry out
Example, other alternatives can be also used for some known technologies those skilled in the art and are implemented；And attached drawing part
Merely to more specifically describing embodiment, and it is not intended as and the utility model is specifically limited.
As shown in Figure 1, the urea pump detection device resetted with overcurrent and overload, including：Controller and it is attached thereto
Urea pump even load, protection circuit, and the external power supply being connected with controller, load and protection circuit, protection circuit and control
The reset pin of device processed is connected.
Circuit is protected to include sample resistance, the first operational amplifier, the second operational amplifier；One termination of sample resistance
Ground, the anode of the other end connection external power supply of sample resistance, and the first operational amplifier is also connected by first resistor
Inverting input, the normal phase input end of the first operational amplifier are grounded by second resistance, the output terminal of the first operational amplifier
The inverting input of the second operational amplifier is connected by 3rd resistor；The normal phase input end connection the 4th of second operational amplifier
One end of resistance and one end of the 5th resistance, the 4th resistance the other end connection external power supply cathode, the 5th resistance it is another
End connection ground, the output terminal of the second operational amplifier connect the reset pin of controller by the 6th resistance；As shown in Fig. 2, its
In the first operational amplifier and the second operational amplifier realized by LM358, can also be realized by other two-stage amplifiers.
The circuit structure is simple, high sensitivity, reliable operation, is particularly suitable for the overcurrent protection electricity of after-treatment system hardware
Road.
Lower mask body illustrates protection circuit theory.Protection circuit is made of three parts, and first part is to take
Voltage on sample resistance R1, R1 changes with the curent change of load, and electric current is big, and R1 both end voltages are also high, accesses the anti-of UA
It is to prevent excessive voltage from entering amplifier and causing amplifier to be damaged to the first resistor of input terminal.
The second part is signal amplification (the UA parts of LM358), due to the signal very little of the resistance sampling of prime, so
Must be amplified with amplifying circuit to use, and amplification factor is determined by the resistance between No. 1 foot and No. 2 feet of LM358.
Part III is comparator circuit, and amplifier amplifies the signal of sampling, then compares by this level, so as to go to control
The reset pin of the action of rear class processed, i.e. controller, so as to end driving power, makes it without any output.
Usually the reset pin of controller is that low level is effective, and the normal output of LM358 is high level, therefore
In the utility model, the positive output end of two level comparator sets two level comparator by the 4th resistance R2 and the 5th resistance R3
The threshold value of the voltage of normal phase input end, i.e. overcurrent protection, when load short circuits, overload cause overcurrent when, two level comparator it is reverse
When input terminal voltage can exceed its normal phase input end voltage, you can reach to allow and protect the low level effect of circuit output, dexterously
Realize and be effectively connected with the low level of controller reset pin.
When the voltage of the normal phase input end of two level comparator is according to load maximum, the inverting input of two level comparator
For voltage come what is set, normal phase input end voltage is greater than the voltage of inverting input when loading maximum.Certainly, it is impossible to gap mistake
Greatly, excessive circuit is just not sensitive enough.Normal range (NR) is set in beyond maximum reverse inter-input-ing voltage 20%-35% or so.
Preferably, self- recoverage insurance is concatenated between the 4th resistance and external power supply cathode.
As shown in figure 3, after controller drives urea pump even load, controller to reset by CAN bus or pwm signal, its
The I/O port of driving load is without any output, so as to achieve the purpose that overcurrent and overload protection.
In one embodiment, external power supply provides 24V voltages, and sample resistance is 0.1 ohm, the first operational amplifier
Amplification factor is 10 times, and the normal phase input end voltage of the second operational amplifier lies prostrate for 3.8-4.
The specific work process of the utility model is as follows：
During normal work, the voltage of the reverse input end of Fig. 2 voltage comparators UB is less than normal phase input end voltage, and UB's is defeated
It is " 1 " to go out voltage, and the reset pin (NRST) that AMP_OUT ports do not trigger MCU resets, and the corresponding port driven of MCU is born
Carry work.
When overload or short circuit, first stage amplifier UA output end currents can become larger (level off to infinity), while UA moment
Output end voltage can increase, it is connected with the inverting input of two-stage amplifier again, then this voltage moment can be higher than UB
Normal phase input end voltage so that two-stage amplifier UB output voltage upset be " 0 ", reversed immediately by high level as low electricity
Flat, the reset pin (NRST) of AMP_OUT ports triggering MCU resets, and there is no appoint for the corresponding driving load ports of MCU at this moment
The output of what drive signal, plays a protective role.
Certainly, the utility model also has various other embodiments, without departing from the spirit and substance of the case in the present invention, ripe
Various corresponding changes can be made according to the present invention by knowing those skilled in the art, but this change should all belong to the utility model
Appended scope of the claims.
Claims (7)
1. it is a kind of with overcurrent and overload reset urea pump detection device, including controller and be connected with the controller bear
Carry, protection circuit and the external power supply being connected with the controller, the load and the protection circuit, the load include
Urea pump, it is characterised in that：The protection circuit is connected with the reset pin of the controller.
2. the urea pump detection device according to claim 1 resetted with overcurrent and overload, it is characterised in that：
The protection circuit includes sample resistance, the first operational amplifier and the second operational amplifier；
One end ground connection of the sample resistance, the other end of the sample resistance connects the anode of the external power supply, described to take
The other end of sample resistance also connects the inverting input of first operational amplifier by first resistor；
The normal phase input end of first operational amplifier is grounded by second resistance, the output terminal of first operational amplifier
The inverting input of second operational amplifier is connected by 3rd resistor；And
One end of normal phase input end the 4th resistance of connection and one end of the 5th resistance of second operational amplifier, the described 4th
The other end of resistance connects the cathode of the external power supply, the other end ground connection of the 5th resistance, second operation amplifier
The output terminal of device connects the reset pin of the controller by the 6th resistance.
3. the urea pump detection device according to claim 2 resetted with overcurrent and overload, it is characterised in that described the
The voltage of the normal phase input end of two operational amplifiers is more than the inverting input of the second operational amplifier described in when loading maximum
Input voltage.
4. the urea pump detection device according to claim 3 resetted with overcurrent and overload, it is characterised in that described outer
The voltage of portion's power supply is 24 volts, and the sample resistance is 0.1 ohm, and the amplification factor of first operational amplifier is 10 times,
The voltage of the normal phase input end of second operational amplifier lies prostrate for 3.8-4.
5. the urea pump detection device according to claim 2 resetted with overcurrent and overload, it is characterised in that the guarantor
The first operational amplifier and the second operational amplifier in protection circuit use two-stage amplifier.
6. the urea pump detection device according to claim 1 resetted with overcurrent and overload, it is characterised in that the control
Device processed drives the load by CAN bus or pwm signal.
7. the urea pump detection device according to claim 1 resetted with overcurrent and overload, it is characterised in that described multiple
When position pin resets, the output terminal of the controller is without output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720580118.5U CN207301140U (en) | 2017-05-24 | 2017-05-24 | The urea pump detection device resetted with overcurrent and overload |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720580118.5U CN207301140U (en) | 2017-05-24 | 2017-05-24 | The urea pump detection device resetted with overcurrent and overload |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207301140U true CN207301140U (en) | 2018-05-01 |
Family
ID=62271893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720580118.5U Active CN207301140U (en) | 2017-05-24 | 2017-05-24 | The urea pump detection device resetted with overcurrent and overload |
Country Status (1)
| Country | Link |
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| CN (1) | CN207301140U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111794836A (en) * | 2020-07-06 | 2020-10-20 | 无锡沃尔福汽车技术有限公司 | Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump |
| WO2021227647A1 (en) * | 2020-05-09 | 2021-11-18 | 深圳市云伽智能技术有限公司 | Urea pump driving testing apparatus and system |
-
2017
- 2017-05-24 CN CN201720580118.5U patent/CN207301140U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021227647A1 (en) * | 2020-05-09 | 2021-11-18 | 深圳市云伽智能技术有限公司 | Urea pump driving testing apparatus and system |
| CN111794836A (en) * | 2020-07-06 | 2020-10-20 | 无锡沃尔福汽车技术有限公司 | Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump |
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